Quarter	Percent
1991-01-01	14.52
1991-04-01	19.22
1991-07-01	20.65
1991-10-01	17.18
1992-01-01	14.90
1992-04-01	14.92
1992-07-01	14.91
1992-10-01	13.76
1993-01-01	10.95
1993-04-01	13.19
1993-07-01	12.57
1993-10-01	11.65
1994-01-01	12.04
1994-04-01	12.78
1994-07-01	12.69
1994-10-01	14.54
1995-01-01	12.21
1995-04-01	12.84
1995-07-01	11.41
1995-10-01	11.18
1996-01-01	10.33
1996-04-01	12.44
1996-07-01	14.11
1996-10-01	12.50
1997-01-01	12.93
1997-04-01	11.15
1997-07-01	13.11
1997-10-01	20.66
1998-01-01	22.43
1998-04-01	16.43
1998-07-01	8.48
1998-10-01	7.04
1999-01-01	5.02
1999-04-01	4.79
1999-07-01	4.74
1999-10-01	4.79
2000-01-01	5.10
2000-04-01	5.12
2000-07-01	5.13
2000-10-01	5.37
2001-01-01	5.05
2001-04-01	5.03
2001-07-01	4.33
2001-10-01	4.01
2002-01-01	4.01
2002-04-01	4.30
2002-07-01	4.30
2002-10-01	4.31
2003-01-01	4.24
2003-04-01	4.01
2003-07-01	3.74
2003-10-01	3.77
2004-01-01	3.75
2004-04-01	3.76
2004-07-01	3.52
2004-10-01	3.27
2005-01-01	3.24
2005-04-01	3.27
2005-07-01	3.24
2005-10-01	3.70
2006-01-01	3.97
2006-04-01	4.17
2006-07-01	4.47
2006-10-01	4.50
2007-01-01	4.60
2007-04-01	4.54
2007-07-01	4.98
2007-10-01	4.99
2008-01-01	4.97
2008-04-01	4.95
2008-07-01	5.22
2008-10-01	3.27
2009-01-01	1.77
2009-04-01	1.93
2009-07-01	1.99
2009-10-01	2.00
2010-01-01	2.01
2010-04-01	2.00
2010-07-01	2.27
2010-10-01	2.50
2011-01-01	2.92
2011-04-01	3.21
2011-07-01	3.25
2011-10-01	3.26
2012-01-01	3.25
2012-04-01	3.26
2012-07-01	2.99
2012-10-01	2.75
2013-01-01	2.74
2013-04-01	2.49
2013-07-01	2.50
2013-10-01	2.50
2014-01-01	2.48
2014-04-01	2.48
2014-07-01	2.23
2014-10-01	1.99
2015-01-01	1.82
2015-04-01	1.57
2015-07-01	1.48
2015-10-01	1.48
2016-01-01	1.49
2016-04-01	1.28
2016-07-01	1.24
2016-10-01	1.22
2017-01-01	1.23
2017-04-01	1.24
2017-07-01	1.25
2017-10-01	1.51
2018-01-01	1.49
2018-04-01	1.49
2018-07-01	1.54